Calking tool guide



26, 1937. J D sE E 2,068,874.

CALKING TOOLIGUIDE Filed Jan. 28, 1936 INVENTOR V 4705 22 JJSez'Zer ATTORN EY Patented Jan. 26, 1937 UNITED STATES PATENT OFFICE CALKING TOOL GUIDE Application January 28, 1936, Serial No. 61,149

2 Claims.

This invention deals with calking tools in general and in particular to a calking tool guide.

Previous calking of rivets has required skilled labor and it has been almost impossible for small plants or repair shops to maintain expert calkers. In the attempts of these small plants and repair shops to train ordinary mechanics a large amount of time and material has been necessary which in a majority of the cases has been wasted for it has been found that but a small number of the mechanics have the necessary skill to become expert calkers. It is impossible for a novice and nearly impossible for the average mechanic to hold and operate a pneumatic calking tool in such a manner as to produce a first class calking job. It is an object, therefore, of this invention to provide a calking tool guide which will enable even unskilled labor to do a first class calking job.

Another object of this invention is the provision of a calking tool guide that will aid the average person to become an expert calker.

A further object of this invention is the provision of a calking tool guide wherein the tool is so held as to cause a creeping action of the tool.

A still further object of this invention is the provision of a calking tool guide wherein the tool is held in proper calking position on the rivet head.

These and other objects will be apparent to one skilled in the art from a study of the following description and accompanying drawing in which:

Figure 1 is a side view of the improved calking tool and guide;

Fig. 2 is another side view of the device shown in Fig. 1 but looking in the direction of the arrow;

Fig. 3 is a bottom plan view of the device, and

Fig. 4 is a sectional view taken on line 4--4 of Fig. 1.

Referring now to the drawing in detail, it is seen that the device consists of a guide or centering standard A, tool holding arm B and calking tool C. The guide or centering standard is preferably formed from a single piece of metal having a slightly enlarged end 2 with a bore 4 therein joined to the edge of the piece by a tapered or conical portion 6 formed to have bearing upon the rivet head 8. The upper part of the metal piece is threaded as at 9 to receive a lower adjusting nut l0 and a bearing guide l2 having a ball bearing seat [4 cut therein to receive balls l6 and a stem portion l8 forming a smooth bearing for the arm B. A top adjusting nut 20 is also carried by the threads and can be clamped upon the stem l8 which is of the proper length to allow free rotation of the arm around the stem and this nut is held in place by the lock nut 2 I. It is thus seen that by proper manipulation of the adjusting nuts that the ver- 5 tical position of the arm may be regulated as desired and for a purpose to be described later.

The arm B is formed with an opening 22 adapted to surround the stem 18 and with a ball race 24 to engage the ball bearings, and is also formed with another opening 26 spaced from the previously mentioned opening to receive the calking tool. This opening has fiat portions 21 to engage the calking tool and prevent its rotation and the opening is formed so that its axis is at an angle to the axis of the stem receiving opening in order that the calking tool may engage the rivet head at the proper location and angle. A small hole 28 is provided in the arm to receive the lower end 30 of a spring 32 and this lower end is bent over as at 34 to retain the spring in position on the arm.

The calking tool is formed at one end with a shank 36 adapted to fit within the end of a pneumatic or other hammer, the other end being properly shaped to form a curved portion 38 which is sharpened to provide a relatively steep incline 40 on the leading edge and a relatively fiat incline 42 on the trailing edge. The trailing edge is also nearer the center of the rivet than the leading edge as shown in Fig. 4 and this, together with the inclination of the edges and the fact that the center line 44 of the lower end I of the tool is to one side of the center line 46 of the tool shank and centering standard, will cause a decided creeping tendency causing the tool and arm to rotate around the centering standard.

The operation of the device is as follows: The conical portion is placed upon the rivet head with its axis substantially coinciding with the rivet axis, and pressure is applied to the pneumatic hammer thus compressing the spring 32 and holding the standard firmly in place upon the rivet head. It is only necessary for the operator to turn on the hammer and swing it in an are causing the calking tool to travel in a circle around the edge of the rivet, thus preventing any chance of injuring the plate adjacent the rivet.

As different calking tools are used it will be 50 necessary in order to maintain the correct relation between the tool edge and the rivet to adjust the position of the arm on the standard, but this is readily accomplished by means of the threaded portion of the standard. 5

The invention has been described more or less in detail, but it is to be understood that various modifications and arrangements of parts may suggest themselves to one skilled in the art and such changes are contemplated as fall within the scope of the following claims.

What isclaimed is:

1; A calki'ng device for use with a pneumatic hammer including a centering member formed with a rivet engaging lower extremity and a threaded shank, an adjustable nut engaging the threaded portion of said shank and formed with a bearing seat, a holding arm formed with spaced openings having relatively inclined axis, said centering standard being adapted to extend through one of the openings in said arm, a bearing adjacent said opening formed for cooperation with said nut bearing, antifriction members between said bearings, a calking tool having a working edge and shank arranged for reciprocating movement in the other opening in said arms, and a spring on said shank having one extremity secured to said arm.

2. A calking device for use with a pneumatic hammer including a centering member formed with a rivet engaging lower extremity and a threaded shank, a nut adjustably engaging said threaded shank including an annular shoulder formed with a bearing raceway and a bearing collar, a calking tool including a working extremity and shank portion, and a connecting arm for said centering member and oalking tool formed with spaced angularly arranged guide opening, said connecting arm being provided with a bearing face adjacent one of the openings for cooperation with the annular bearing face of said nut, and means for securing said calking tool against rotary movement in its guide opening.

JOHN D. SEILER. 

